Camshaft adjuster

Abstract

A camshaft adjuster for adjusting the relative angular positions of a camshaft and a crankshaft of an internal combustion engine in accordance with a setting shaft is provided. In which the setting shaft is driven by a setting assembly and has a driving connection with an adjusting gear through a coupling. The drive moment is transmitted in the coupling by a radial extension ( 21 ) of a first coupling half ( 19 ), which contacts a second coupling half ( 25 ) without play in a circumferential direction and which is movable in a direction of a Y-Y axis relative to a second coupling half ( 25 ). This permits compensation of eccentricities between the setting shaft of the setting assembly and the adjusting gear.

1. A camshaft adjuster for adjusting a relative angular position of a camshaft relative to a crankshaft of an internal combustion engine comprising a setting shaft, which is driven by a setting assembly and which is in driving connection with an adjusting gear through a coupling, a transfer of a drive moment is performed by a radial extension of a first coupling half of the coupling, which contacts a second coupling half without play in a circumferential direction and which is movable in a radial direction relative to the second coupling half. 
   
   
     2. The camshaft adjuster according to  claim 1 , wherein the radial extension is pivotably supported for movement relative to the second coupling half parallel to a longitudinal axis of the second coupling half. 
   
   
     3. The camshaft adjuster according to  claim 2 , wherein at least one contact surface between the radial extension and the second coupling half has a crowned construction. 
   
   
     4. The camshaft adjuster according to  claim 1 , wherein the radial extension is constructed separate from the setting shaft and is connected to the setting shaft via a shaft-hub connection. 
   
   
     5. The camshaft adjuster according to  claim 4 , wherein the radial extension and the setting shaft are connected to each other via an interference fit, a non-positive-fit connection, or a positive-fit connection, or attachment means. 
   
   
     6. The camshaft adjuster according to  claim 4 , wherein the radial extension is produced without cutting. 
   
   
     7. The camshaft adjuster according to  claim 1 , wherein the radial extension is constructed separate from the setting shaft and is inserted into a recess of the setting shaft. 
   
   
     8. The camshaft adjuster according to  claim 7 , wherein the radial extension is constructed as a pin, which is inserted into the recess of the setting shaft. 
   
   
     9. The camshaft adjuster according to  claim 1 , wherein the radial extension is held in a radial recess of the second coupling half without play in the circumferential direction. 
   
   
     10. The camshaft adjuster according to  claim 9 , wherein the radial recess has approximately Ω-shaped inner contours in a cross section of the second coupling half. 
   
   
     11. The camshaft adjuster according to  claim 9 , wherein the recess is an axial groove in the second coupling half which is constructed as a hollow shaft. 
   
   
     12. The camshaft adjuster according to  claim 1 , wherein the first coupling half with the extension is movable axially relative to the second coupling half. 
   
   
     13. The camshaft adjuster according to  claim 1 , wherein forces flow between the radial extension and a second coupling surface via an element that is elastic in the circumferential direction. 
   
   
     14. The camshaft adjuster according to  claim 13 , wherein the elastic element is an elastomer, thermoplastic, or duroplastic, which is vulcanized onto one of the coupling halves. 
   
   
     15. The camshaft adjuster according to  claim 1 , wherein at least one of the first coupling half and second coupling half comprise a sheet-metal part. 
   
   
     16. The camshaft adjuster according to  claim 1 , wherein the first coupling half with the radial extension has a mass-balancing element for compensating an unbalanced mass due to the radial extension. 
   
   
     17. The camshaft adjuster according to  claim 1 , wherein the first coupling half is locked in rotation with the setting shaft.